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Preparation method of silica-coated quantum rod

A technology of silicon dioxide and quantum rods, which is applied in the field of nanomaterials, can solve the problems of limiting the application of display technology, the inability to coat quantum rods, and the inability of quantum rods to achieve efficient and stable quantum rods, etc., and achieve the effect of increasing the fluorescence quantum yield

Inactive Publication Date: 2019-07-23
SHENZHEN PLANCK INNOVATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is also used to prepare coated quantum dots, and cannot be coated with quantum rods.
[0007] The difficulty of current quantum rod technology is that efficient and stable quantum rods cannot be realized, which limits the application of this technology in display technology

Method used

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  • Preparation method of silica-coated quantum rod
  • Preparation method of silica-coated quantum rod
  • Preparation method of silica-coated quantum rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In this example, silica-coated quantum rods were prepared through the following steps

[0049] (1) Mix 10nmol of CdSe / CdS core / shell quantum rod n-hexane solution with 100mL of n-heptane and 32mL tetrapolyethylene glycol monolauryl ether in a single-necked flask, and stir for 10min with a magnetic stirrer to make The solution is mixed thoroughly.

[0050] (2) Slowly add 5.5 mL of ammonia water with a concentration of 2.6% to the mixed solution in step (1), and stir for 1 hour to form a microemulsion;

[0051] (3) Add 0.25 mL of TEOS to the microemulsion, slowly stir and react for 48 hours, add methanol to the solution, break the emulsion, centrifuge at low speed, remove the supernatant, and obtain silicon dioxide-coated quantum rods.

[0052] (4) Disperse the silica-coated quantum rods obtained in (3) in an ethanol solution.

[0053] The quantum rods with CdSe / CdS core / shell structure and the quantum rods coated with silica were observed by transmission electron micro...

Embodiment 2

[0055] In this example, silica-coated quantum rods were prepared through the following steps

[0056] (1) Mix 10nmol of CdSe / CdS core / shell quantum rod n-hexane solution with 100mL of n-heptane and 32mL tetrapolyethylene glycol monolauryl ether in a single-necked flask, and stir for 10min with a magnetic stirrer to make The solution is mixed thoroughly.

[0057] (2) Slowly add 5.5 mL of ammonia water with a concentration of 2.5% to the mixed solution in step (1), and stir for 1 hour to form a microemulsion;

[0058] (3) Add 0.05mL of TEOS to the microemulsion, slowly stir and react for 48 hours, add methanol to the solution, break the emulsion, centrifuge at low speed, remove the supernatant, and obtain the silica-coated quantum rods, the TEM picture is as follows image 3 shown.

[0059] (4) Disperse the silica-coated quantum rods obtained in (3) in an ethanol solution.

Embodiment 3

[0061] In this example, silica-coated quantum rods were prepared through the following steps

[0062] (1) Mix 10nmol of CdSe / CdS core / shell quantum rod n-hexane solution with 100mL of n-heptane and 32mL tetrapolyethylene glycol monolauryl ether in a single-necked flask, and stir for 10min with a magnetic stirrer to make The solution is mixed thoroughly.

[0063] (2) 5.5 mL of ammonia water with a concentration of 2.8% was slowly added dropwise to the mixed solution in step (1), and stirred for 1 h to form a microemulsion;

[0064] (3) Add 0.03mL of TEOS to the microemulsion, stir slowly and react for 48h, add methanol to the solution, break the emulsion, centrifuge at low speed, remove the supernatant, and obtain the silica-coated quantum rods. The TEM picture is as follows Figure 4 shown.

[0065] (4) Disperse the silica-coated quantum rods obtained in (3) in an ethanol solution.

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Abstract

The invention provides a preparation method of a silica-coated quantum rod, the preparation method comprises the following steps of: (1) dissolving a solution of CdSe / CdS quantum rod in a solvent containing an emulsifier, and stirring and mixing; (2) dropping ammonia water into the mixed solution obtained in the step (1) to form microemulsion; (3) adding TEOS to the microemulsion obtained in the step (2) for reaction, and adding methanol to demulsify after the reaction to obtain the silica-coated quantum rod; according to the preparation method provided by the invention, the quantum rod is synthesized first, then the surface of the quantum rod is coated with a silica shell layer, the nanocrystal with a more efficient and stable silica-coated quantum rod structure is prepared; and comparedwith the quantum rod which is not coated with silica, the fluorescence quantum yield is obviously increased and is more stable; and because the rod-shaped nanocrystal has polarization characteristics,and can be applied to display devices with polarization functions.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a preparation method of silicon dioxide-coated quantum rods. Background technique [0002] Quantum dots are an important low-dimensional semiconductor material, whose size in three dimensions is not larger than twice the exciton Bohr radius of the corresponding semiconductor material. Quantum dots are generally spherical or quasi-spherical, and their diameters are usually between 2-20nm. Quantum dots are nano-scale semiconductors. By applying a certain electric field or light pressure to this nano-semiconductor material, they will emit light of a specific frequency, and the frequency of the emitted light will change with the size of the semiconductor. Therefore, the color of the light emitted by the nano-semiconductor can be controlled by adjusting the size of the nano-semiconductor, because this nano-semiconductor has the characteristics of limiting electrons and electron holes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88B82Y20/00B82Y30/00
CPCB82Y20/00B82Y30/00C09K11/02C09K11/883
Inventor 王恺孙小卫刘皓宸卢睿周子明杨鸿成郝俊杰
Owner SHENZHEN PLANCK INNOVATION TECH CO LTD
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